Drug interactions
Erythromycin + Lofepramine
Severity: Major
Erythromycin and Lofepramine: major interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Both drugs can prolong the QT interval, increasing the risk of ventricular arrhythmia including torsade de pointes. Erythromycin may also raise tricyclic levels.
What this interaction means in plain words
Erythromycin and Lofepramine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Additive QT prolongation, with possible CYP3A4 inhibition raising lofepramine exposure.
What to do
Avoid the combination if possible by using another antibiotic. If necessary, obtain a baseline ECG, correct electrolytes and monitor QTc.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Erythromycin
- Conivaptan + Erythromycin Contraindicated
- Dihydroergotamine intranasal + Erythromycin Contraindicated
- Dihydroergotamine + Erythromycin Contraindicated
- Domperidone + Erythromycin Contraindicated
- Dronedarone + Erythromycin Contraindicated
- Droperidol + Erythromycin Contraindicated
Frequently asked questions
Can I take Erythromycin with Lofepramine?
MediHelp rates the interaction as major. Erythromycin and Lofepramine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Both drugs can prolong the QT interval, increasing the risk of ventricular arrhythmia including torsade de pointes. Erythromycin may also raise tricyclic levels.
How serious is the interaction between Erythromycin and Lofepramine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid the combination if possible by using another antibiotic. If necessary, obtain a baseline ECG, correct electrolytes and monitor QTc.
What other medicines interact with Erythromycin?
MediHelp also lists interactions of Erythromycin with, for example, Conivaptan, Dihydroergotamine intranasal, Dihydroergotamine. The full list is on the Erythromycin page.
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